1997 (Pocket Monsters 2)
This logo was used during the initial planning stages of the game.
1998 (Pocket Monsters Gold & Silver)
In 1998, when the games were re-announced, the games were renamed Gold & Silver respectively and the "2" was dropped.
1999 (Pocket Monsters Gold)
This is the final version of the logo used when the game was finally released in 1999.
2000 (Pokémon Gold)
The boxart for Pokémon Gold.